AerTennis is a fun motion-sensing tennis app for fans. No rackets, courts or nets are needed — its iPhone sensors track swings so you can practise tennis anywhere. it’s ad-free with a one-time purchase for lifetime use and free updates. It accurately recognises all core strokes, measures swing speeds of 50–210 km/h, offers immersive real-time feedback, and displays weekly training stats via neat charts with a simple interface.